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Measurement and analysis of the reactionγγ→3π +3π -

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>1991
<mark>Journal</mark>Zeitschrift für Physik C Particles and Fields
Issue number4
Number of pages10
Pages (from-to)531-540
Publication StatusPublished
<mark>Original language</mark>English


The reactionγγ→3π +3π - has been studied usig the JADE detector at PETRA. The topological cross sectionσ(γγ→3π +3π -) was measured in the CM energy range 1.5–5.5 GeV. The production ofρ 0,s was observed and the average number ofρ 0,s per event measured. The contributions of the subprocessesγγ→ρ 02π +2π -,γγ→ρ 0 ρ 0 π +2π - andγγ→ 3π +3π - (phase space) were studied and 95% C.L. upper limits for the cross sectionσ(γγ→ρ 0 ρ 0 π + π - determined. Finally the Bose-Einstein correlation for pairs of like signed pions was observed. A fit to a standard parametrization gave results consistent with other studies of this effect in pion systems.